Step & Key Operation
(When using EL-9600)
*Use either pen touch or cursor to operate.
Display
(When using EL-9600)
Notes
EL-9600 Graphing Calculator
*
(repeatedly)
Note that the tracer is flashing
on the curve and the
x
and
y
coordinates are shown at the
bottom of the screen.
The root is exactly
x
= 1.
(Zooming is not needed to
find a better approximate.)
Move the tracer near the left-hand
root.
2
-
1
Zoom in on the left-hand root.
2
-
2
Move the tracer to approximate the
root.
2
-
3
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Return to the previous decimal
viewing window.
3
-
1
Move the tracer to approximate
the middle root.
3
-
2
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Move the tracer near the right-
hand root.
Zoom in and move the tracer to
find a better approximate.
4
The calculator allows the roots to be found (or approximated) visually by
graphing a polynomial and using the Zoom-in and Trace features.
Tracer
Tracer
Tracer
*
(repeatedly)
*
*
*
or
*
(repeatedly)
*
*
*
(repeatedly)
*
*
*
or
*
(repeatedly)
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
4-1
The root is :
x
-0.42
The root is :
x
2.42
Tracer
ZOOM
TRACE
ZOOM
ZOOM
TRACE
TRACE
TRACE
A
3
2
A
3
H
HB1.DocB.
98.10.1, 11:31 AM
5